l undell



A. E. LUNDELL.

TELEPHONE SYSTEM.

APPLICATION FILED FEB. 17, 1917.

1381,4180, Patented June 14, 1921.

M WM for; Afbvn E. Lunde/A ,the form of lamps, and also the controlling;

UNITED, STATES PATENT" OFFICE.

ALBENV E. LUNDELL, on NEW YORK, 1?. Y., ASSIGNOR r PANY, INCORPORATED, on NEW YORK, N.

WESTERN ELECTRIC COM- Y., ACORPORATION on NEW YORK.

TELEPHONE SYSTEM.

To all whom it may concern Be it known that I, ALBEN E. LUNDELL, a citizen of the United States, residing at New York, in the county of Bronx and State of New York, have invented certain new and useful Improvements in Telephone Systems,

of which the following is a full, clear, concise, and exact description. V

This invention relates to telephone systems, and more particularly to class-of-service indicating devices employed in such sys tems. 1

In manual telephone systems, it is customary to provide near the jack of the sub,- scribers lines some means for indicating to the operator the class of serviceto which the subscriber is entitled. In semi-automatic telephone systems, especially those employing cal-l distribution, it is essential to provide some analogous means for informing the operator of the character of the call which is to be answered.

7 The main feature of the present invention resides in the provision of a pluralityof signals associated with anoperators position, which are variably operated bycode signals generated by anim pulse generating device common to a plurality of lines and which in- "form the operator of the characterof the calling line.- controlling circuit common to all the lines having a particular class of service, conducts the impulses characteristic of that particular class from the impulse transmitting device tothe class-of-service indicating means.

The drawings diagrammaticallyrepresent a portion of a telephone system employing thepresent invention. The portion of the diagram within the dotted lines represents the circuits of a line finder and the operators telephone set. At the lower left of the drawings there is diagrammatically shown the impulse transmitting device. At

the lower right of the drawings there is diagrammatically indicated the classot-"service indicating signals which are here shown in -.ipparatus employed in transmitting the code Specification of Letters Patent. Patent d J 14 1921 Application filed February 17, 1917. Serial No. 149,223. i

impulses and the general arrangement of the class-of-service indicating signals, and the manner in which they are actuated.

5 designates a code impulse transmittin device which consists D ing sliai t provided with cams which successively: close contact springs controlling break points in the controlling circutis of the class-ot-service indicating signals. ,F or clearness in disclosure the impulse transmitting device 5 is shown-diagrammatically as consisting of a rotating arm which rotates in a cloclrwise direction to connect b'attery'to the various contacts'designated' 7 This rotating arm 6 successively engages the contacts 7 7?. 7 and 7 to close break points in the actuating circuits of the relays 8, 9, 10 and also under predeterpoint in' operator and 11 respectively, mined conditions to close a break the conductor 16. lVhen now the depresses key K, other relays 18, 19, and 21 are actuated and locked up in the various combinations, depending on which of the relays S, 9, 10 and 11 are energized to con-- trol th lighting oflamps 98, 22, 23, 24:, and 26. Lamp 98 inthis arrangement designates a fiat rate line, lamp 22 a message register? line, lamp 23 indicates a party line, lamp 2 L characterizes an independent line or individual line, lampi 25 denotes a coin'collect line, and lamp 26 indicates a private branch exchange or P. B. X. line. It will be understood that these characterizations are-arbitrary and that other desigiTations or forms of signals other than lamps may be employed.

It will be understood that the conductor 16 is common to all the lines of a given class.

I In the pres nt disclosure four lines are indi- .vided with a coin collecting box. When the 's'ubscr ber at substation A removes his reof a constantly rotatgrounded battery. The primary magnet interrupts its own operating circuit at its armature and contact to advance the brushes 33, 34.1, and 36 of the line finder to hunt for the group in which the calling line terminate-s, The relay 28 at its left-hand armature connected ground to the commutator segment 29 to identity the group in which the calling line terminates, and when this groupis reached the commutator brush 37 will be in engagement with the grounded commutator segment 29 to energize the escape magnet 30. This energizing circuit may be traced from grounded battery winding of the "escape magnet 30, side-switch wiper 38 in its first position, commutator brush 37, commutator segment 29, left-hand contact and armature of relay 28 to ground.

The escape magnet 30 is energized and the sideswitch, which in this instance operates on the energization of the escape magnet, moves its wipers into the second position.

' In position 2 of the side switch, the escape magnet 30 is energized over a circuit extending from grounded battery, winding of the escape magnet 30, back contact and armature of relay 39, side-switch wiper 40 in its second position to ground. The side switch in this instance does not move its wipers until the escape magnet deenergizes. Simultaneously with the energization of escape magnet 30 an operating circuit is completed for the secondary motor magnet ll, which circuit may be traced from grounded battery, winding, armature and contact of magnet ll, side-switch wiper ll) in its second position, to ground. The secondary motormagnet ll. interrupts its operating circuit and thereby advances the brushes of the finder over the terminals of the lines in the selected group. As soon as the test brush of the finder encounters the terminal 42 oi the calling line, the test relay 39 is energized over a circuit established from grounded battery, winding of the relay 39, sideswitch wiper 5'13 in its second position, test brush test terminal 42, conductor 43, resistance e l, rigl'it-hand armature and contact of relay 2? to ground. The relay 39 attracts its armature to complete a shunt circuit about armature and contact of magnet and at its back contact interrupts the energizing circuit of the escape magnet 30.

The escape magnet 30 deenergizes and thereby causes the side switch to move its wipers into their third position.

In position 3 a circuit is closed from grounded battery through the resistance, side-switch wiper 99 in its third position, test brush of the finder, test terminal 42, conductor 4-5, winding of cut-off relay 46 to ground. It will be understood that the cutoff relay 16 was not energized in series with the relay 39, owing to the high resistance of the relay 416. In the third position of the side switch, however, the cut-oil relay is energized to attract its armatures and thereby disconnects the line relay 27 from the calling subscriber.

With the side-switch wipers l7 and 48 in their third position, and with the finder brushes 33 and 3-1- in engagement with. the line terminals 49 and 50 respectively of the calling line, the calling subscribers substation A. is included in circuit with the supervisory relay 51, winding 52 of the repeating coil and grounded battery.

When the calling line is extended to the operators position a supervisory signal is actuated in the well-known manner to indicate this condition to the operator. The operator then depresses her listening key 53 to telephonically connect her telephone set, generally designated at 5-1, with the calling substantion A. The operator also depresses the key K which in practice is controlled by the listening-in key At the time the key K is depressed, a circuit is closed from ground, contact 61, conductor winding of relay 63 to grounded battery, to cause the relay 63 to attract its armatures.

When the arm 6 connects battery to the contact 7, a circuit is closed through conductor 16, resistance 55, erminal 56, finder brush 36, side-switch wiper 57 in its third position, conductor 58, contact 59, relay 60 to ground. The relay 60 is energized in this circuit and attracts its armature. At the same time when the arm 6 engages the contacts 7, a circuit is closed from grounded battery through the arm 6 and contacts 7, conductor 12, winding of the relay 8, conductor 64:, contact 65, and armature of the relay 63 to ground. The relay 8 attracts its armature and closes a breakpoint in the energizing circuit of relay 21, which circuit may be traced from grounded battery, winding oi relay 21, conductor 66, armature and contact of relay 8, conductor 67, contact and armature of relay 60, which it will be remembered is now energized, resistance 68, conductor 69, contact 7 O to ground. The relay 21 attracts its armatures and at its left-hand front contact and armature establishes a locking circuit for itself from grounded battery, winding of relay 21, front contact and :armature of this relay, armature and back contact'of relay 20, conductor 69, contact 70, armature of relay 63, to ground. When now the arm 6 is advanced to engage the contact 7", a circuit is again closed through conductor 16 to energize the relay 60, and a parallel circuit is closed through conductor 13, winding of relay 9, contact 71, armature of relay 63 to ground. The relays 9 and attract their armatures and a circuit is thereby established from grounded battery, Winding of the relay 20, conductor 72, armature and front contact of relay 9, conductor 67 front contact and armature of relay60, resistance 68, conductors and 69, contact 70, an armature of relay 63, to ground. The relay 2O attracts its armature and thereby completes a locking circuit from grounded battery, winding, front contact and armature of relay 20, conductor 73, winding of the relay 74, conductors 75, 69, contact 70, an armature of relay 63 to ground. The locking circuit of the relay 21 now extends through conductor 73 in parallel with the locking circuit of the relay 20. When the contact arm 6 is advancedto engage the contact 7, the relay 60 is again energized through conductor 16, and a parallel circuit is closed from grounded battery, through conductor 14, winding of relay 10, contact 76, an armature of relay 63, to ground. The relays 10 and 60 are energized and attract their armatures. A circuit is thereby closed from grounded battery, winding of relay 19, armature and contact of relay 10, conductor 67, contact and armature of relay 60, resistance 68, conductors 75 and 69, contact 70, an armature of relay 63 to ground. The relay 19 attracts its armatures and at its left-hand front contact and armature completes a locking cir-' cuit for itself from grounded battery, the winding, left-hand front contact and armature of relay 19, left-hand armature and back contact of relay 18, conductor 69, contact 70, an armature of relay 63 to ground.

hen the contact arm 6 reaches the contact 7 .an energizing circuit for the relay 60 is again closed through conductor 16, and a circuit in parallel with the last described circuit is completed through conductor 15, winding of the relay 11, uppermost armature and contact of relay 63, to ground. The relays 11 and 60 attract their armatures and complete a circuit from grounded battery,

' winding of the relay 18, armature and contact of relay 11, conductor 67 contact and armature of relay60, resistance 68, conductors 75 and 69, contact 70 to ground. The relay 1 8 attracts its armatures and .completes a locking circuit for itself from grounded battery, the winding, left-hand front contact and armature of relay 18, conductor 78, winding of relay 77, conductors 75, 69, contact 70, an armature of relay 63 to ground. The locking circuit'of relay 19 now extends through the conductor 78 and the winding of relay 77 to ground. Relays 74 and 77 attract their armatures to close local circuits for lighting lamps 25 and 26. Lamps 98, 22, 23, 24 are connected in parallel with relays 18, 19, 20 and 21 respectively, but are not energized at this time, owing to the high resistance of the windings of relays 74 and 77. The lamp 26 indicates that the calling line is a private branch exchange or P. B. X. line, and the lamp 25 indicates that this line is also a coin collect line.

Now let us assume that one of the lines 79 or 80 belonging to the class known as the independent coin collect line to which the conductor 17 is common, is calling. Under this assumption when the movable arm 6 of the impulse transmitting device encounters the contacts 7 a circuit is close from grounded battery, the arm 6, contact 7, resistance 81, conductor 17, terminal 82, finder brush 36, side-switch Wiper 57, conductor 58, contact 59, winding of relay 60 to ground. A circuit in parallel with the circuit just described is completed through conductor 12, winding of relay 8, conductor 64, contact 65, an armature of relay v63, to ground. The relays 8 and 60 attract their armatures to complete a circuit for energizing the relay 21. This circuit is established from grounded battery, winding of relay 21, conductor 66, armature and contact of relay 8, conductor 67, contact and armature of relay 60, resistance 68, condiutors 75, 69, contact 70, an armature of relay 63 to ground. The relay 21 attracts its armature and thereby establishes a locking circuit for itself, which extends from grounded battery, winding of relay 21, left-hand front contact and armature of relay 21, armature and back contact of relay 20, conductor 69, contact 70, an armature of relay 63, to ground. Vvhen the arm 6 engages the contact 7 a circuit is closed through conductor 13, to ground at an armature of relay 63 to energize the relay 9. In this instance there is no contact 7 to complete an energizing circuit for the relay 60 through the conductor 17. The relay 20 is therefore not energized. lVhcn the arm 6 is advanced to engage contact 7 relay 60 is energized through conductor 17 and the relay 1O simultaneously energized by a circuit completed through conductor 14. With the relays 10 and 60 energized, an operating circuit is completed for the relay 19 from grounded battery, winding of.

this relay armature and contact of the relay 10, conductor 67, contact and armature of relay 60, resistance 68, conductors 75, 69, contact 70, an armature of relay 63, to ground. Relay 19 attracts its armatures and at its left-hand armature and front contact completes a locking circuit for itself, which is established from grounded battery,

winding of relay 19, left-hand front contact andarmature of this relay, armature and back contact of relay l8, conductor 69, contact 70, an armature of relay 63 to ground. The arm 6 is new advanced to engage the contact 7, and a circuit is closed through conductor 17 to energize the relay 60, and in parallel a circuit is closed through conductor 15, winding of relay 11, uppermost contact and armature of relay 63 to ground. The relays 11 and 60 attract their armatures to complete a circuit for energizing relay 18, which circuit may be traced from grounded battery, winding of the relay 18, armature and contact of the relay 11, conductor 67, contact and armature of relay 60, resistance 68, conductors 75, 69, contact 70, an armature of relay 63, to ground. Relay 18 attracts its armatures and establishes a look ing circuit for itself which is completed from grounded battery, winding of relay 18, its left-hand front contact and armature, conductor 78, winding of relay 77, conductors 7 5, 69, contact 70, an armature of relay 63, to ground. When the relay 18 attracted its left-hand armature, the locking circuit of the relay 19 isthen maintained through the conductor 78, winding of relay 77, conductors '75. 69.. contact 70, to ground. Lamps 24 and 25 are now lighted to indicate that the line 86 is an independent coin collect line. The circuit for lighting the lamp 24: may be traced from grounded battery through lamp 24, conductor 66, left hand front contact and armature of relay 21, armature and back contact of relay 20, conductor 69, contact 70, an armature of relay 63, to ground. The circuit for lighting the lamp 25 is controlled at the armature and contact of the relay 7?. With the relay 7'? energized, a circuit closed from grounded battery, winding of relay 83, contact S l, conductor 85, left-hand contact and armature of relay 7? to ground.

The relay 83 controls coin collection in the well-known manner. Vl hen the line is a message rate line, code impulses will be transmi ted to lock p the relay 19 and relay 21, which relays remain locked up m0- mentarily aft-er the release of key K due to the slow release of relay 63. Under these conditions circuit is completed for the relay 86 from grounded battery, winding of relay S6, contactspring 87, contact 88 when key K is released, conductor 89, right-hand armature of relay 21, right-hand armature and baclr contact of relay l8, right-hand frontcontact and armature of relay 19, conductor 90, contact 91,, conducting portion 161 of arm 6, which is insulated from the remaining portion of arm 6, contact 92 to ground. The relay 86 controls the operation of the message register.

At the close of the conversation, supervisory relays 51 and 93 inform the operator of the termination of the call, whereupon she removes plug 94 from the ack 95 of the line leading to the called substation B. lVhen the calling subscriber at substation A replaces his receiver on the switchhook, the supervisory relay 51 deenergizes and retracts its armature. A circuit is thereupon closed for the release magnet 96, which circuit is completed from grounded battery, winding of relay 96, side-switch wiper 97 in its third position, back contact and armature of supervisory relay 51 to ground. The release magnet 96 establishes a locking circuit for itself through the off normal contact 102.

What is claimed is:

1. in a telephone system comprising a plurality of lines extending to a central office, means for impressing upon each line a characteristic number of electrical impulses for its identification, an extension circuit for said lines, a group of relays associated with said extension circuit, means for causing the successive impulses impressed upon an extended line to selectively effect the operation of any one of said relays independently of the action ofany other relay of said group, and signals associated with said relays and a1 *an'ged to be displayed under the control thereof.

2. A telephone system comprising a plurality of lines, an operators position, a trunk for extending any one of said lines to said operators position, means for impressing upon each line a characteristic number of electrical impulses for its identification, a group of relays and corresponding signals adapted to be brought into association with said trunk at said operators position, and means variably operated in response to electrical impulses for variably actuating any one of said relays independently of the action of any other relay of said group,

3. In a telephone system, in combination with a pluralityof lines suitable for different classes of service, means for extending any one of said lines to an operators position, a class-of-service identifying device arranged to produce and apply to said lines different and characteristic groups of electrical impulses, signals, a series of sig nal-controlhng relays at the operators position, each of said relays being variably operated independently of the action of any other relay of said series in response to impulses of a group to produce an indication corresponding to the number of impulses in the particular group that identifies the extended line, and a locking circuit for each relay closed during the operation of said relay.

4. In a telephone system, in combination with a circuit, a plurality of lines adapted to be severally extended thereto, of an identifying device common to said lines and arranged to apply to the various lines various numbers of electrical impulsesfor their identification, a group of controlling relays, each of said relays being operable independently of the action of any other of said relays, signals controlled selectively by said relays, and a locking circuit for each relay closed durin the operation of said relay.

5. g controlling system comprising means for simultaneously generating two series of electrical impulses, a train of relays successively operated in response to one ofsaid series of impulses, each of said relays being operable independently of the operation of c any other of said relays, and devices variably operated under the joint control of said group of relays, and the other of said series of said impulses. V v

6. A controlling system comprising means for generating a primary series of impulses and a secondary series of impulses, a primary group of relays responsive to said primary impulses, each of said primary relays being operable independent of the operation of any other of said primary relays, a secondary group of relays variably operated under the control of the relays of the primary group and in response to said secondary impulses, and devices controlled by the secondary group of relays.

7. A controlling system comprising means for generating a primary series of impulses and a secondary series of impulses, a primary group of relays responsive to said primary impulses, each of said primary relays being operable independent of the operation of any other of said primary relays, a secondary group 01 relays variably operated ALBEN E. LUNDELL. 

